Deuteronomy 3:18-22 - Instructions To The Transjordanian Tribes
18 And I commanded you at that time saying, Jehovah your God has given you this land to possess it. You shall pass over armed before your brothers the sons of Israel, all the sons of might. 19 But your wives and your little ones, and your cattle, (I know that you have much cattle), shall stay in your cities which I have given you 20 until Jehovah has given rest to your brothers, as well as to you, and they also possess the land which Jehovah your God has given them beyond Jordan. And then you shall each one return to his possessions which I have given you.
21 And I commanded Joshua at that time saying, Your eyes have seen all that Jehovah your God has done to these two kings. So Jehovah shall do to all the kingdoms where you pass. 22 You shall not fear them. For Jehovah your God shall fight for you.